"Mayhem," presented by Fresquez Productions in association with Route 66 Casino Hotel, will feature Holm defending her International Boxing Association (IBA) light welterweight title in the 10-round main event against former NABC lightweight titlist McGee, who fights out of Gary, Indiana.

"Holly Holm has repeatedly proven that she’s the best pound-for-pound women’s fighter in the world," promoter Lenny Fresquez said. "Mary McGee is a bright, talented boxer who earned this world title shot. She impressed us all last December in her fight on the Holm-Prazak card at Route 66 Casino Hotel. Unlike others that call-out Holly, only to break negotiations because they were never serious, Mary is stepping up to the plate like a real fighter."